The parent without primary custody pays child support to the parent with primary custody
Child support is a legal obligation, not a choice. The parent who does not have primary physical custody of the child must pay the other parent a set amount each month. The court decides who pays, how much, and for how long based on state law, both parents' incomes, and the custody arrangement.
In most cases, the parent with primary custody receives the payment. If custody is split equally, the parent with the higher income usually pays the parent with the lower income. The obligation continues until the child reaches the age of majority in your state — typically 18, but sometimes 19 or 21 if the child is still in high school or has a disability.
Child support is separate from custody. A parent can have joint custody and still owe child support. A parent can lose custody and still be ordered to pay. The two decisions are made independently by the court.
Key Takeaways
- The parent without primary custody pays the parent with primary custody, as determined by a court order or signed agreement.
- The amount is calculated using your state's formula, which weighs both parents' gross income, custody time, and sometimes childcare or health insurance costs.
- Child support continues until the child turns 18, or older in some states if the child is still in high school or has special needs.
- If you do not pay, the other parent can ask the court to enforce the order through wage garnishment, tax intercept, or contempt charges.
- You can request a modification if your income drops significantly or custody changes, but you must file a motion with the court.
How courts decide who pays and how much
Every state has a child support guideline — a formula that calculates the amount based on both parents' gross income. Gross income includes wages, self-employment income, rental income, Social Security, unemployment benefits, and sometimes bonuses or commissions. The court starts with this number and adjusts it based on custody time and other factors.
If one parent has the child more than 50 percent of the time, that parent usually receives support from the other. If custody is 50-50, the parent with higher income pays the parent with lower income. Some states also factor in the cost of childcare, health insurance premiums, and extraordinary medical expenses when setting the amount.
The court can deviate from the guideline formula if it finds the result would be unjust — for example, if one parent has a very high income and the guideline amount would be excessive, or if one parent has other children they support. You can ask the judge to deviate, but you must present evidence and explain why the guideline amount is unfair.
When both parents share custody
Shared custody does not mean no one pays child support. If both parents have the child roughly equal time but one earns significantly more, the higher-earning parent still pays. The calculation accounts for the time each parent spends with the child and reduces the payment accordingly.
Some states use an "income shares" model, which assumes both parents contribute to the child's expenses in proportion to their income. Others use an "obligor" model, which focuses on the non-custodial parent's obligation. The result is similar, but the math differs. Your state's child support office or a family law attorney can explain which model applies where you live.
If custody changes — for example, if the child moves in with the other parent — the support obligation can flip. The parent who now has less time with the child may become the payer instead of the receiver. This requires a court order to change, not just a verbal agreement.
Self-employed parents and income calculation
If you are self-employed, the court uses your net business income — revenue minus legitimate business expenses — to calculate support. You will need to provide tax returns, profit-and-loss statements, and sometimes business bank statements. The court can also look at prior years' returns to spot patterns of income hiding or unusual deductions.
If your business income fluctuates, the court may average your income over two or three years rather than using a single year. If you recently started a business, the court may use income from your previous job as a baseline. If you deliberately reduced your income to lower your support obligation, the court can impute income — assign you an income level based on your earning capacity — and order you to pay based on that figure instead.
Self-employed parents should keep detailed records. If you cannot produce documentation, the court may assume your income is higher than you claim or use the other parent's estimate of what you earn.
What happens if you do not pay
Child support is enforceable by law. If you fall behind, the other parent or the state's child support enforcement agency can take action. The most common enforcement methods are wage garnishment (money taken directly from your paycheck), tax intercept (your tax refund applied to arrears), and liens on property you own.
If you owe a large amount and do not pay, you can be held in contempt of court, which can result in fines or jail time. You can also lose your driver's license, professional license, or passport. Some states suspend hunting and fishing licenses for parents who are significantly behind on support.
If you lose your job or your income drops, you are still legally obligated to pay. However, you can file a motion to modify the order. The court will not automatically reduce your obligation — you must ask. If you do not ask and simply stop paying, arrears accumulate and enforcement actions begin.
Modifying a child support order
You can request a modification if there has been a material change in circumstances — usually a significant change in income, custody, or the child's needs. A job loss, a new job with lower pay, a promotion, or a change in custody all may have access to. A small income change (typically less than 10 percent) usually does not.
To modify, you file a motion with the court that issued the original order. You must provide recent pay stubs, tax returns, and documentation of the change. The court will recalculate the amount and issue a new order. Until the new order is signed, you still owe the original amount.
Modifications are not automatic. If your circumstances change and you do not file, you continue to owe the original amount. If you file and the court finds no material change, the order stays the same. Some states allow you to request a review every three years even without a change in circumstances.
Unmarried parents and paternity
If parents are not married, child support still applies — but only after paternity is established. Paternity can be established by signing a voluntary acknowledgment form, by DNA testing, or by a court order. Once paternity is established, the non-custodial parent owes support just as a divorced parent would.
If you are an unmarried parent and the other parent is not paying, you can file with your state's child support enforcement agency. They can locate the other parent, establish paternity if needed, and pursue collection. This service is usually free to you.
If you are the parent being asked to pay and you dispute paternity, you can request a DNA test. The court will order the test at no cost to you. If the test shows you are not the biological parent, your obligation ends. If it confirms you are the parent, the obligation begins from the date you are ordered to pay, not from the child's birth.
Frequently Asked Questions
Can I stop paying child support if the other parent will not let me see the child?
No. Child support and custody are separate legal matters. If the other parent is blocking your time with the child, you can file a motion to enforce your custody rights, but you still owe support. The court will not let you use non-payment as leverage. If you stop paying, you will face enforcement action, and your custody case will be heard separately.
What if the child does not want to live with the custodial parent anymore?
If the child is old enough and wants to move in with the other parent, custody can be modified. You would file a motion to change custody. If the court agrees, the support obligation may change — the parent who now has less time may become the payer. The change is not automatic; a new court order is required.
Do I have to pay child support if I am unemployed?
You still have a legal obligation, but the amount may be reduced. If you are unemployed through no fault of your own, you can file a motion to modify based on your current income (often zero or very low). The court may set a minimal amount or suspend payment temporarily. However, arrears continue to accumulate unless the court specifically waives them, and you must actively file the motion — it does not happen automatically.
Can child support be forgiven or waived?
Only the court can waive or reduce child support, not the other parent. Even if the custodial parent says they do not want the money, you cannot simply stop paying without a court order. If you want to stop or reduce payments, you must file a formal motion. The court will consider your request but is not required to grant it.
What if I have other children I support?
Other children you support can be a factor in calculating your child support obligation. The court may reduce the guideline amount if you have significant support obligations for other children. You will need to provide documentation — birth certificates, custody orders, or proof of support — to show the court that these obligations exist.